Free SMS service provider may require additional payment for services.
upMessage is the app for users, whose job requires a lot of SMS sending every single day. The app is integrated directly within a Salesforce platform. ##It provides users with the ability to send SMS, covering up a few mobile providers.
We show Salesforce accounts that are linked to Trailblazer.me and have the Manage Billing permission. If your account is missing, check that you connected the account to your Trailblazer.me profile. Then verify that you’ve been assigned the Manage Billing permission in the related org.